Re: [Xen-users] Live Migration - Freeze

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2013-10-08 at 09:15 -0600, Shane Johnson wrote:
> On Tue, Oct 8, 2013 at 7:32 AM, Ian Campbell <ian.campbell@xxxxxxxxxx> wrote:
> > On Tue, 2013-10-08 at 07:23 -0600, Shane Johnson wrote:
> >> Ian,
> >> Thank you for the info, I can't find the log file you mentioned though
> >> where should it be located
> >
> > It should be in /var/log/xen on the target system i.e. the one you are
> > migrating to.
> >
> >>  and what does it mean if it doesn't exist?
> >
> > I'm not sure, your sender side logs seem to suggest that something is
> > receiving, so I'd have thought the log really should be there...
> >
> >>
> >> Thanks
> >> Shane
> >>
> >> On Tue, Oct 8, 2013 at 7:16 AM, Ian Campbell <ian.campbell@xxxxxxxxxx> 
> >> wrote:
> >> > On Mon, 2013-10-07 at 08:47 -0600, Shane Johnson wrote:
> >> >> relevant.  xl-Win98.log and qemu-dm-Win81.log are included from the
> >> >
> >> > You might find the *-Win98-incoming*.log on the target contains some of
> >> > the more interesting stuff, from the sending end things look mostly ok.
> >> > I don't know if all of the
> >> >         xc: detail: type fail: page 136 mfn 0001f888
> >> > stuff is worrying or not...
> >> >
> >>
> >>
> >>
> >
> >
> 
> Nope no incoming log.
> Did some more testing and here is what I found.
> First some details  - scutter is the oldest machine, builder is next
> and then sdj is the newest.
> I tested starting the DomU on each machine and seeing where I can
> migrate to.  I can migrate from scutter to either of the other
> machines but that is the only source to destinations that works.
> With this, I am thinking it's the CPU flags.  During all these tests,
> the *-incoming*.log file wasn't created until the end of the migration
> so no info there on why they are locking up.

It might be possible to hack things so that the "xl migrate-receive" on
the target gets -vvv too. ISTR having to change xl_cmdimpl.c to do this
though...

It might also be worth having a look at xen's dmesg on the target.

> Ian, you mentioned that the flags aren't as big of a problem with XCP.
>  Could you provide a quick and dirty explanation on why?

XCP has more user interface to simplify things when doing host-wide
levelling, by figuring out some of the magic numbers you need.

Ian.

> 
> Thank you Ian for all your help.
> 



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